Blindstitching, overseaming, and serging attachment for sewing machines.



VvNo. 350,851. A TATENTEIJ APE. I6. 1907. A

y E. RICHTER. E ELINDSTITGHING, OV'EESEAMING, AND SEEGING ATTACHMENT EUR SEWING MACHINES. f APPLICATION FIL'ED 001.31, 1906.

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ATTORNEY fue Nomzls Psrnks coI, wasumarou. n. c.

UNITED STATES .PATENT oEEIcE.

EDWARD RICHTER, OF NEW YORK, N. Y., ASSIGN OR OF ON E-TI-IIRD TO GAR- RITT H. OLIVER, OF NEW YORK, Y., ONE-THIRD TO MATTIE E. BULL, OF GARWOOD, NEW JERSEY, AND ON E-THIRD TO CHARLES S. AMERMAN,

OF WASHINGTON, NEW JERSEY.

BLINDSTTTCHING, OVERSEAMING, AND SERGING ATTACHMENT FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented April 16, 1907,

To LZZ whom it may concern,.- Be it known that I, EDWARD RICHTER, a citizen of the United States, residing in the borough of Brooklyn, city, county, and State of New York, have invented a new and useful Improvement in Blindstitching, Overseaming, and Serging Attachments for Sewing-Machines, of which the following is a specification.

My invention relates to sewing-machine attachments of the kind that mechanically p shift the work out of the path of the needle of the sewing-machine every other stroke thereby enabling the operator to make any desirable fancy stitching, such as blindstitching, overseaming, or serging.

The object of my invention is to provide improved means for transmitting and converting the `reciprocating motion of the needle-bar of the sewing-machine to the required intermittent reciprocating motion of the work-shifting device at right angles to the plane of the needle.

The foregoing and other features of my invention will now be described in connection with the accompanying drawings, forming part of this speciiication, in which I have represented myy attachment embodying the improvements in the preferred form, after which I shall point out -more particularly in the claims those features which I believe to be new and of my own invention.

Referring to the accompanying one sheet of drawings, in which similar characters of reference indicate like parts throughout the several views, Figure 1 is a plan view in part section of my improved attachment, showing the work-shifting device in eXtreme right position. Fig. 2 is an elevation of same. Fig. 3 is a plan view similar to Fig. 1, showing the work-shifting device in eXtreme left position. Figs. 4 and 5 show my improved cloth-guiding device.

1 is the base-plate of my attachment.

2 is ahousing for the workingparts. drawings I have represented it to be cylindrical in shape, and for convenience of construction it is divided into two parts and fastened to each other and to the base-plate 1 by means of screws. On the inside of the housing 2 are bearings 3 and 4, in which is movably mounted the shaft 5. Near one In theend of this shaft 5 is mounted the cross-arm 6 at right angles to the shaft 5. On the other end and outside of the housing 2 is mounted a crank 7, provided with a slot 8.

Vertically mounted in suitable bearings in housing 2 is the shaft or member 9, provided on its lower end with a cam 12. Directly above the cam 12 is a ratchet 13, which is engaged by the spring-pawl 14, mounted on lug 15 by means of screw 16. On the upper end of member 9 are mounted two cross-arms 1() and 11 at right' angles to each other and at right angles to the member 9. The arms 10 andl 11 are mounted so that when member 9 revolves they straddle the member 5 and alternately are engaged by arms 6.

17 Ais my work-shifting device, and consists of an L-shapedV tongue slidably mounted in slot or channel 20, the end of which is held in engagement with the face of the cam 12 by the spring 18, mounted at 19.

21 is the needle, and 22 is the reciprocating needle-bar of any sewing-machine. -On the needle-bar 22 is a pin 28, adapted to slide in slot 8 of lever 7, thereby oscillating the member 5. ,i

The reciprocating motion of the needle-bar oscillates the shaft 5 and cross-arms 6, which swing through an are sufficient to engage first one of the cross-arms 10, then one of the cross-arms 11, mounted on shaft 9, and so on. This intermittently rotates the shaft 9 and the motion is made positive and definite by the action of the spring-pawl 14 andratchet 1.3. The rotating of this member 9, which is provided at its lower end with the cam 12, advances the spring-returned work-shifting device 17. As will be readily understood by referring to the drawings, for every stroke of the needle-bail the cross-arms 6 of the oscillating member 5 describe two arcs, each time engaging one cross-arm of member 9, rotating that member ninety degrees. Two complete strokes of the needle-bar, therefore, completely rotate the member 9 once,.which reciprocates the work-shifting device. We now have reciprocating motion of the needlebar reduced to half-time reciprocating motion of the work-shifting device at right angles, which is so timed that the work is pushed out of the path of the needle every other stroke or stitch just before the needle IOO is about to pierce the cloth and after the cloth has been advanced by any well-known means in any sewing-machine.

I will now proceed to describe the construction and action of my cloth-guiding device, as shown in Figs. 1 and 2 attached to the plate of my blindstitching attachment and in Figs. 4 and 5.

3() is a spring-plate eccentrically mounted to base-plate l by the eccentric 31.

32 is a thumb-screw which screws into base-plate l, passing through a slot in plate 30, the function of which is to guide and regulate the height of springplate 30.

On end of springplate 3() are two clothguiding faces 33 and 34 at right angles to each other, 33 being a horizontal plate, 34 a vertical plate. On the top of 33, pivotedly mounted at 36, is an indicating-arm 37 with pointer 38. The indicating-arm 37 is provided with a lip 4:0, which engages the pointer and carries it against the action of spring 42 into the graduated arc 39. When the indieating-arm is in contact with the needle 21, any adjustment of the plate 30 by the eccentric .3l is indicated on the arc, as will be readily understood by referring to Figs. l and 4, The lip 4l on top of 33 is adapted to engage lip 4() and prevent the indicating-arm from jarring into the path of the needle after it has been thrown out of position. (See Fig. 5.)

I wish it distinctly understood that my attachment herein illustrated and described is in the form which I desire to construct it and that any changes or variations may be made as may be convenient or desirable without departing from the salient features of my in vention, and I therefore intend the following claims to cover such modification as naturally fall within the lines of invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1.4 In a machine of the character described, the combination with a spring-actuated work-shifting device, an oscillating shaft provided with means to oscillate said shaft, cross-arm mounted on one end of said shaft, a rotating member rovided with means to reciprocate the wor c-shifting device, crossarms mounted at or near the top of said rotating member adapted to be engaged by the cross-arm of the oscillating member, whereby the oscillating member rotates the rotatingmember intermittently and in one direction.

2. In a sewing-machine attachment such as is used for blindstitching, serging, or overseaming, the improved means for imparting the required motion to the work-shifting device comprising a rotary member provided with two cross-arms, one of said arms )assing through the rotary member a short istance below the other, an oscillating shaft provided at one end with a cross-arm adapted to engage the cross-arms of the aforesaid rotary member, a work-shifting device adapted to be reciprocated by the aforesaid rotary member.

3. In a sewing-machine attachment such as used for fancy stitching, blindstitching, serging and overseaming, the improved means for imparting the required intermittent motion to the reciprocating worl-shift ing device, comprising a spring-returned work-shifting device,'a rotary member provided with two through cross-arms, an oscil lating member receiving its rocking motion from a reciprocating member of a sewingmachine, provided with a cross-arm adapted tary member whereby intermittent, unidirectional rotary motion is transmitted to the rotating member, a cam on said rotary member for periodically actuating the said workshifting device, a cloth-guiding device provided with cloth-guiding surfaces and indicating means which, when brought into contact with a part of the sewing-machine shows the relative adjustment of the cloth-guiding surfaces to 'the eXtreme advance position of the end of the reciprocating work-shifting device.

This speciiication signed and witnessed this 23d day of October, A. D. 1906.

EDVARD RICHTER.

In presence of MARGUERITE Ross, EDWD. VAN WINKLE..

8o to engage the aforesaid cross-arms of the ro- 

